None I was a software contractor there twice (GoogleX and Google Pay). Google doesn't care about contractors. Contractor job specifications are narrowly defined so don't worry about attending meetings because they don't care what you have to say. Just do your job, eat, and go home. You get none of the benefits that regular employees get. Hourly pay may be equal but no stocks or bonuses obviously. You don't get to participate in group activities. Keep in mind you are not one of them, you're a short timer (< 1yr contract). No prospect for conversion either. Do it for the money and your resume. BTW, Google doesn't like it when you say on your resume you worked there even if you are neck deep in a Google project and working/sitting with Google co-workers. I just add "contractor at Google" to my title.